Toray Industries, Inc.

Johnathan C Hughes

Hiroaki Sakata

Kenichi Yoshioka

Atsuhito Arai

Jeffrey A Satterwhite

An embodiment relates to a resin composition containing a tetraglycidyl amine; a bisphenol epoxy; a dicyandiamide; and an aromatic urea; wherein the tetraglycidyl amine has a EEW of 110 g/eq to 140 g/eq and is an amount of 30 to 60 PHR per 100 PHR of total epoxy resin in the resin composition; wherein the resin composition has a Tg of at least 160&#xb0; C. when cured at 143&#xb0; C. for 3 min and also maintains a Tg of greater than 160&#xb0; C. when cured at 177 C for 1 min or longer.

Epoxy resin composition, prepreg, fiber reinforced plastic material, and manufacturing method for fiber reinforced plastic material

The embodiments herein relate to a benzoxazine resin composition, a prepreg, and a carbon fiber-reinforced composite material. More specifically, the embodiments herein relate to a benzoxazine resin composition that provides a carbon fiber-reinforced composite material that is suitable for use as a manufacture material due to its superior mechanical strength in extreme use environments, such as high temperature and high moisture, as well as a prepreg, and a carbon fiber-reinforced composite material. An embodiment comprises a benzoxazine resin composition having a multifunctional benzoxazine resin; a multifunctional epoxy resin that is a liquid at 40&#xb0; C. and has three or more glycidyl groups; a sulfonate ester; and optionally at least one thermoplastic resin. The resin may include an interpenetrating network structure after curing.

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Tacoma, WA, United States of America

Johnathan C Hughes